Anchoring means



Sept. 6, 1938. w. NOBLE 2,129,439

ANGHORING MEANS Filed Dec. 18, 1954 III/15A Inweaziaw:

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Patented Sept. '6, 193$ PATENT ANCHORING MEANS Warren Noble, Michigan City, 11111., assignor, by

mesne assignments, to corporation of Illinois Cardox Corporation, a

Application December 18, 1934, Serial No. 758,077 13 Claims. (01. 102-11) This invention relates to anchoring means, and more particularly to an improved tamping means for retaining a blasting cartridge in a blast hole drilled in the material to be broken.

An object of this invention is to provide an improved anchoring means. Another object is to provide an improved tamping means for a blast role. Yet another object is to provide an improved hole tamping means having a plurality of resilient holding elements for gripping the walls of the blast hole to provide a seal to prevent the blowing out of the blasting charge and for anchoring the blastiii-gcartridge in position in the blast hole. Still another object is to provide an improved tamping, describable as an umbrella tamping, having a plurality of cup-shaped rubber discsfor gripping the walls of the blast hole for maintaining the blasting cartridge in the blast hole and to provide a seal for the blasting charge. A further object is to provide an improved blast hole tamping means which may be easily and quickly placed in tamping position ina blast hole. These and other objects and advantagesof' the invention will, however, more fully appear in the course of the following description and as more particularly pointed out in the appended claims.

In the accompanying drawing there is shown for purposes of illustration one form which the invention may assume in practice.

In this drawing,--

Fig. 1 is a diagrammatic view showing a blasting cartridge in blasting position in a blast hole drilled in thematerlal to be blasted and with which the illustrative form of the improved tamping and hole sealing means is associated.

Fig. 2 is a side elevational view of the improved tamping and hole sealing means.

Fig. 3 is a sectional view showing one of the resilient sealing and gripping cups.

Fig. 4 is an end view of one of the sealing and gripping cups.

In this illustrative construction there is shown an improved hole tamping and sealing means, generally designated I, aptly describable as an umbrella tamping means, adapted to be inserted in a blast hole A drilled in the material to be broken, for sealing the outer end of the blast hole and for retaining a blasting cartridge B in blasting position in the blast hole. The blasting cartridge B may be of any suitable type,

, butis herein preferably of the type known as a .precharged air'shell". The sealing and tamping means I comprises a central body 2 having a supporting-and positioning portion 3 and mounted on this body is a plurality of yieldable hole gripping and sealing elements 4, there being three herein shown, but obviously more or less may be provided as desired. The tamping body 2 is herein in the form of an exteriorly threaded rod 5 having threaded thereon at different points along its length a plurality of collars 5 held in adjusted position on the rod by locking nuts 6 and each provided with an annular groove 1 for receivinga central body portion of a cup-shaped resilient disc 8, herein preferably composed of rubber or similar resilient material. The supporting and positioning means 3 is in the form of an elongated handle secured at 9 to the outer end of the rod-like portion 2, and adapted to be grasped by the operator for positioning the tamping means in the blast hole.

In the use of the improved hole sealing and tamping means, it will be noted that after the precharged air shell B is inserted in the blast L hole A the operator grasps the handle 3 of the tamping means and quickly shoves the same within the outer end of the blast hole, as shown in Fig. 1, into a position wherein the cup-shaped elements 4 yieldably engage the walls of the blast hole bore. When the blasting charge is released from the cartridge B, the pressure in the blast hole acting on the inner end of the tamping means causes the cup-shaped elements to expand radially, thereby to grip the walls of the hole bore, and as a result sealing the outer end of the blast hole to prevent a blow-out of the blasting charge and to provide an anchor for pre venting ejection of the blasting cartridge, due to its recoil, from the hole. When the blasting charge is released from the cartridge and the material to be broken is broken down, the tamping means is reclaimed for use in the next succeeding blast hole.

As a result of this invention it will be noted that an improved tamping means is provided for use with a blasting cartridge of the pre-charged type known as an air shell", which may be quicklyplaced in position after the shell has been positioned within the blast hole. It will further be noted that by the provision of plurality of resilient rubber cups, an anchoring means is provided for a blasting cartridge, thereby reducing the possibility of the ejection of the cartridge from the blast hole. Further, by the provision of a series of resilient cups an efiective seal for the hole is provided for preventing a blow-out of the blasting charge. These and other objects and advantages of the hole tamping and sealing means will be clearly apparent to those skilled in the art.

While there is in this application specifically described one form which the invention may assume in practice, it will be understood that this form of the same is shown for purposes of illustration and that the invention may be modified and embodied in various other forms without departing from its spirit or the scope of the appended claims, I

What I claim as new and desire to secure by Letters Patent is:

1. A tamping and sealing means for a blast hole comprising a central body having mounted thereon a plurality of concavo-convex rubber cups adapted to grip the walls of the blast hole bore, the opposite faces of each cup being curved on arcs of different radii.

2. A tamping means for a blast hole comprising a central body, a plurality of resilient cup-shaped elements, means individual to each element for adjustably mounting and locking the element on said body, and a supporting and positioning handle secured to said central body whereby the tamping means may be readily inserted within the blast hole bore.

3. A tamping and sealing means for a blast hole comprising a central body having mounted thereon a plurality of concavo-convex rubber cups adapted to grip the walls of the blast hole bore, the opposite faces of each cup being curved on arcs of difierent radii, and a supportingand posi-' tioning handle secured to said central body whereby the tamping means may be readily inserted within the blast hole bore.

4. A tamping means comprising an elongated threaded rod, a plurality of resilient cup-shaped elements for gripping the walls of a blast hole bore, and a supporting sleeve for each element threaded on the rod.

5. Tamping means for a blast hole comprising a unitary device adapted to be inserted into a blast hole independently of and unattached to a blasting charge, said device comprising a threaded rod, a plurality of sleeves threadedly adjustable on said rod, a rubber concavo-convex uninterrupted gripping and sealing element mounted on each sleeve, each of said elements being normally or" greater diameter than that of the blast hole and having its opposite faces curved on radii of different lengths, a lock nut for retaining each threaded sleeve in its desired adjusted position on said rod, and a manipulating handle mounted on one end of the rod.

6. A tamping and sealing means for a blast hole comprising a rod, a plurality of sleeves independently adjustably mounted on said rod, independent means for locking each sleeve in its adjusted position, and a resilient cup-shaped element for gripping the walls of a blast hole mounted on each sleeve.

7. A tamping and sealing means for a blast hole comprising a rod, a plurality of sleeves independently adjustably mounted on said rod. and a concavo-convex resilient member mounted on each sleeve adapted to grip the walls of the blast hole, the faces of each member being shaped to converge from the sleeve toward the periphery to form an outwardly tapering body.

8. A reusable tamping means for retaining a blasting cartridge and the pressure of its charge in a blast hole comprising a central body having a plurality of resilient cup-shaped elements mounted on said body out oi contact with each other, and means for bodily adjusting each of said elements along said body to vary independently the spacing of the elements while assembled on said body.

9. A reusable tamping means for retaining ablasting cartridge and the pressure of its charge in a blasting hole comprising a central body having a plurality of resilient cup-shaped elements mounted on said body out of contact with each other, all of said cup-shaped elements adapted to grip the wall of the blast hole to a greater degree upon endwise movement of the body inan outward direction by force developed within the blast hole.

'10. Tamping means for retaining a blasting cartridge and the pressure of its charge within a blast hole comprising a self-contained reusable unit adapted to be inserted in a blast hole independently of and unattached to a blasting cartridge, said unit including a central body having a manipulating handle at one end, a plurality of uninterrupted resilient gripping and sealing ele-' ments normally of materially greater diameter than that of the holemounted on said body, said elements being adapted to grip the wall of the hole to a greater degree as a result of force being applied thereto from within the hole, and means individual to each element for adjustably mounting and locking the element on said body.

11. Tamping means for a blast hole comprising a central body, and a resilient, convexo-concave, outwardly tapered, uninterrupted sealing and gripping element mounted on the central body, the opposite faces of said element being curved on arcs of difierent radii.

12. Tamping means for a blast hole comprising a central body, a plurality of resilient cup-shaped elements, and means individual to each element for adjustably mounting and locking the elements on said central body.

13. Tamping means fo'r a blast hole comprising an elongated threaded rod, a plurality of resilient elements for gripping the wall of the blast hole, and means threadedly supported on said rod for independently adjustably mounting each of said elements.

WARREN NOBLE. 

